Abstract
The magnetic properties of (Y1-xNdx)2BaNiO5 with x = 0.01, 0.02, 0.03, 0.04, and 0.05 are investigated by means of specific heat, magnetic susceptibility, and spectroscopic measurements. We estimate a magnetic contribution of the neodymium subsystem into the magnetic susceptibility and specific heat using temperature dependencies of the splitting of the ground Kramers doublet of the Nd3+ ion obtained from spectroscopic experiments. We estimate also the contribution caused by nickel chain breaks and by ferrons. Different scenarios of low-temperature magnetic behavior are discussed.
Highlights
In the compounds that contain chains of magnetic ions with the spin S = 1, a disordered ground state with a gap in the spectrum of magnetic excitations is realized [1]
In this paper we study specific heat, magnetic susceptibility, and spectroscopic properties of (Y1-xNdx)2BaNiO5 compounds with low concentrations of neodymium
After subtracting the magnetic susceptibility of nickel subsystem taken from the data on Y2BaNiO5, we get an estimate for the effective magnetic moment
Summary
In the compounds that contain chains of magnetic ions with the spin S = 1, a disordered ground state with a gap in the spectrum of magnetic excitations (the so-called Haldane gap) is realized [1]. Inelastic neutron scattering experiments have revealed a coexistence of the Haldane-gap excitations and spin waves in the ordered state and an increase of the Haldane gap with decreasing the temperature below TN [7, 9]. In this situation, it is not clear how does the Ni subsystem behave in the thermodynamic properties. In this paper we study specific heat, magnetic susceptibility, and spectroscopic properties of (Y1-xNdx)2BaNiO5 compounds with low concentrations of neodymium
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